-- @testpoint: opengauss关键字Immutable(非保留)，作为函数名,部分测试点合理报错

--关键字不带引号-成功
drop function if exists Immutable;
create function Immutable(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--关键字带双引号-成功
drop function if exists "Immutable";
create function "Immutable"(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--关键字带单引号-合理报错
drop function if exists 'Immutable';
create function 'Immutable'(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--关键字带反引号-合理报错
drop function if exists `Immutable`;
create function `Immutable`(i integer)
returns integer
as $$
begin
    return i+1;
end;
$$ language plpgsql;
/
--清理环境
drop function if exists immutable(integer);
drop function if exists "Immutable"(integer);